Elevator-brake.



110. 856,576. PATBNTBD JUNE 11, 1907. MUGLELLAN PULLENLOVE.

BLW113011 BRAKE. APPLIOATION FILED MAR. 13, 1905.

MM @J F V. if M D h 1 Y 7 Y WDJWDJDDDDDDDDDD. 11.5!A 13D@ specification.

'UNITED STATES PATENT OFFIO MCCLELLAN FULLnNLovE, ornouisvnmn, KENTUCKY, AssreNon To Tnt; FULLENLovn ritavnron coMPANY, or Lornsvrtnn, KENTUCKY, A

CORPORATION OF KENTUCKY.

ELEVATOR-BRAKE.

. Specification of Letters Patent.

Patented' June 11, 1907.v

.To alt whom tt'm'y con/cern:

Be it vknown that I, MCCLELLAN FU'LLEN- LOVE, a citizen of the United-States, and a resident of Louisville, inthe county of Jefferson and State ofKentuck ,have invented certain new and useful lym Elevator-Brakes,- of which the following is a This invention relates to elevatorbrakes. In an application filed by me on August/4",

j 1904, I have shown a iixed rack, and a spiral traveling withthe cage on the fixed rack and movable axially against a conical 'and frictional braking surface. This ty e of brakin g surface is very effective' for lgraking` the car; but when it is desired to startthe car after itl has been braked I have found that a binding action takes lace, sometimes makin the starting very;v ifficult.

tisthereforean object of this invention to. provide abraking surface thatwill permit the quick raising of the car after a braking. action.4 l

A further ob'ectis to provide teeth on the traveling spira and theixed rack'which-reduce the 'fruitionbetween said parts.

.In they drawingsz'Figure l is one embodi-l ment of my invention showing a single spiral or gear engaging racks on opposite sides of the elevator shaft. Fig. 2 isan embodiment showing two gearshaving separate braking surfaces.' Figs.. 3 and 4 show an embodiment having two gears adapted to interlock.

Fig. 5 is a detail of one of the.fixed racks.

Referring more particularly Mto the drawings, 1 indicates a air of racks having teeth 1" on one side, an 2 indicates the elevator In all embodiments of my invention, when the speed of the elevator exceeds the speed of the gear or gears, the brakin surface on the gear or gears'engages 'the bra y'ng surface tion of thegear in the other direction but Erevent, any binding actionl between the raking surfaces. I

In Fig. 1, the'bottom of the cage 2 is pro- Vvi'ded'with a toothed braking surface 3 .on

its under side, while dependingl from its ccnter 1s a shaft 4 on which 1s jonrnaled a gear provements in 5. Thisl gear 5 is` shorter in the direction of its axis than in the direction of its diameter and has teeth 6 which do not extend comletely around the same. This form of gear 1s especially'adapted to 4prevent undue friction between the gear and the rack. The gear has a toothed upper face 7 adapted to engage the toothed surface 3 when the gear -ismoved axially on the shaft 4 due to excessive speed caused by the drop ing of the elevator cage or otherwisey T e gear, 5 meshes 'with both racks 1 and should the shaft 4 break the gear would be snflicient to su port theelevator.

' n 2 two gears 5, of the same form as that shown'in Fig. 1, are employed. The car 2' is provided with two toothed braking `surfaces 3 while'the gears 5'u areprovided with upper toothed faces 7l and are axially movable on shafts 4a.

In Figs. 3 and 4 two gears 8 and 9 are provided each meshing with one of the racks 1 and of diameters to cause them to overlap one another.' Gear 8 isjonrnaled on shaft 10 and is not adapted to move axially. Gear 9 is journaled on shaft 11 below the gear S and is adapted to move axially so as to throw its teeth 12 into engagement with teeth 13 on the upper gear, the teeth on-both gears being different from the teeth of the. other embodiments, yet permitting them to turn in one direction and not in the other as clearly shown 1n Flg. 4.

arious changes, withm the scope'of the appended claims, may be in ade without departing from the spirit or sacrificing any of the advantages of my invention.

Having thus described my invention, what I claim is:

1. In an elevator brake, the combination with a cage and a 'fixed rack, of a gear moving with the cage, movable axially relatively to the vcage and having braking teeth on one face thereof, and a toothed braking surface moving with the cage and against which the "braking teeth on the gear may move.

2. In an elevator brake, the combination with the cage and' a A'fixed rack, of a gear moving with the cago, having n. toothed braking surface and movable axially' relatively to the cago, and a toothed braking siirface moving with the cago and positioned V to engage the tooth on thc gear when the gear moves relatively to the Cage due to l surface on the cage against which the brak- 1o excessive speed, the teeth being formed to E ing svrfaee on the gear contacts when the cause the braking surfaces to separate when l gear moves axially m one direction.

the. Cage is moved in the other direction. The foregoing specification signed at Louis- 3; In an` elevator brake, a cage, a.pair of l ville Ky this 1st day of Feb, 1905.

fixed racksI one on each side of the cage, a MCCLELLAN FULLENLOVE.

gear carried bythe cage movable axially ln presence ol'- relatively thereto, meshing with both racks, E. K. PENNEBAKER,

and having a braking surface, and braking LAWRENCE S. LEOPOLD. 

